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Projects rear tires with 4.3-1 axle

Discussion in 'Traditional Hot Rods' started by spark, Nov 23, 2013.

  1. I have a 4.3 - 1 rear axle, 283 with 2 speed power glide.

    what height should the rear tires be to get highway speed without too many revs?
     
  2. 327Eric
    Joined: May 9, 2008
    Posts: 1,537

    327Eric
    Member
    from Diablo Ca.

  3. Malcolm
    Joined: Feb 9, 2006
    Posts: 7,738

    Malcolm
    ALLIANCE MEMBER
    from Nebraska

    That's a lot of rear gear to run on the highway without overdrive...
    What kind of car is this going in? If you're building a hot rod, 7.50x16s are very common - 31" tall.

    Using this calculator, you'd be turning 2800 rpm at 60 mph
    http://www.tremec.com/calculadora.php


    Malcolm

    (edit, didn't see the calculator post above...)
     
  4. OldColt
    Joined: Apr 7, 2013
    Posts: 504

    OldColt
    Member

    A 4.30 is more of a dragstrip gear than a highway gear. I would run the tallest tires that fit the car if it was me. With an overdrive of .70 to .80 it's probably fine as is.
     

  5. lostone
    Joined: Oct 13, 2013
    Posts: 1,722

    lostone
    Member
    from kansas

    I would just change gears down to a 3:73 or 3:90 personally. Sounds like way too much gear for a street car.
     
  6. gimpyshotrods
    Joined: May 20, 2009
    Posts: 18,384

    gimpyshotrods
    ALLIANCE MEMBER

    29" and a 700R4.
     
  7. bobwop
    Joined: Jan 13, 2008
    Posts: 6,099

    bobwop
    ALLIANCE MEMBER

    3.90 gears are still too much for a street car. If you want to compete on the freeway
     
  8. squirrel
    Joined: Sep 23, 2004
    Posts: 49,332

    squirrel
    Member

    43" tall tires
     
  9. mechanic58
    Joined: Mar 21, 2010
    Posts: 681

    mechanic58
    Member

    To answer your original question more directly - as big as possible. In fact, you're probably not going to achieve your goal with a tire that is going to look even remotely 'right' on the car. 4.30 is just too low to run without overdrive with a common sized passenger car tire, even a big one.
     
  10. bobwop
    Joined: Jan 13, 2008
    Posts: 6,099

    bobwop
    ALLIANCE MEMBER

    Lol Squirrel
     
  11. squirrel
    Joined: Sep 23, 2004
    Posts: 49,332

    squirrel
    Member

    2.75 is a nice highway ratio with 27" tall tires....so 4.30 would require 43" tires for the same rpm
     
  12. gimpyshotrods
    Joined: May 20, 2009
    Posts: 18,384

    gimpyshotrods
    ALLIANCE MEMBER

    A 0.64:1 overdrive would do the same, without changing the tire size.
     
  13. Russco
    Joined: Nov 27, 2005
    Posts: 4,187

    Russco
    Member
    from Central IL

    Where's your sense of adventure? While that's far from ideal, its a 283 SBC. It wont kill it to run 65MPH with that gear and a 28 or 29 in tire. I doubt you'll find it pleasant but if you had to you could from time to time. I've run my 327 at 82MPH for 100+ miles at a time with a 3.42 and a 28" tire that's about 3300 RPM I still get about 12MPG's.
     
  14. looking at 31inch high- dirt track tires, 820 x15. on a 1928 RPU
    not a lot of highway driving.
     
  15. Kenneth S
    Joined: Dec 15, 2007
    Posts: 1,527

    Kenneth S
    Member

    I used to run a 4.56 gear with a 31" tall tire on the highway with no overdrive, my turbocharged blow thru carb setup 302 Ford had no problem turning 3500 rpms to run 70 mph for a 400 mile road trip, got 13 mpg doing it (on a nice 97 degree day).
     
  16. bobwop
    Joined: Jan 13, 2008
    Posts: 6,099

    bobwop
    ALLIANCE MEMBER

    you should send a PM to the fella that started this thread. You seem to have it all figured out and he was seeking advise. The two of you should get along pretty well.
     
  17. a bit of research based on good advice found here- isn't that the idea?
     
  18. bobwop
    Joined: Jan 13, 2008
    Posts: 6,099

    bobwop
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  19. Gary Addcox
    Joined: Aug 28, 2009
    Posts: 2,435

    Gary Addcox
    Member

    Howdy, spark. My Deuce roadster turns 2100 at 70 mph with a 700R4, 3.73 rearend and 31" Hoosiers. I get 24 mph consistently running a '96-2000 Vortek 350 with a 600 Edelbrock 1406 4 bbl.
     
  20. Gary Addcox
    Joined: Aug 28, 2009
    Posts: 2,435

    Gary Addcox
    Member

    Totally agree with mechanic58.
     
  21. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Yea, but that wouldn't be gay ol' man HAMB street rodder stuff...:rolleyes:Quick cars have no place in traditional hot-rodding, thats for the LS-1 crowd...:D
    Get a T-5 and some 3.08s and run some 30" tall tires. If you run a 4.30 gear with an OD, there will be all sorts of problems. You know, excessive tire wear:rolleyes:, directional instability at WOT;), and if you are a typical HAMBer, potential coronary...
     
  22. sasquatch12
    Joined: Nov 6, 2013
    Posts: 38

    sasquatch12
    Member

    Years back i ran a 4:56 with a 28inch rear tire, with a 283 with an aluminum powerglide and if i remember correctly, 60MPH was 3000 ?
     
  23. 1971BB427
    Joined: Mar 6, 2010
    Posts: 6,912

    1971BB427
    Member
    from Oregon

    I thought I was wound too tight with 3.73 gears, 28" tire, and my 327 SBC. I'd like to go taller tire, but my fenders wont take them. I may swap to a 700r4 from the TH350 so I can cruise at 70 mph and not be so wound up.
     
  24. lostone
    Joined: Oct 13, 2013
    Posts: 1,722

    lostone
    Member
    from kansas

    I ran 4:56's with a rowdy 327 & turbo 400 in my 72 chevy truck. It was great fun stop lite to stop lite but i drraded hiway driving. I havent ran anything ovr 3:90 since. I would run 3.73 on his set up. If mostly highway id run 3:55
     
  25. Mr48chev
    Joined: Dec 28, 2007
    Posts: 29,618

    Mr48chev
    ALLIANCE MEMBER

    That is about what I was thinking when I first read your first post. Will 31 inch tall tires look right on the vehicle though? It doesn't take much change to go from "cool looking" to "cartoon looking" with tire sizes on certain cars.

    i
     
  26. Russco
    Joined: Nov 27, 2005
    Posts: 4,187

    Russco
    Member
    from Central IL

    I'd say a Model A roadster pick up would look great with 31 in tall tire. What do you think?

    BTW a 4.30 with a 31" tire is about the same as a 3.73 with a 26.5 tire (about 3050 rpm's at 65 MPH) not exactly ideal for economy, but a stock 283 in good running condition can cruise at 3050 rpm's all day long.
     

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  27. George Miller
    Joined: Dec 26, 2008
    Posts: 413

    George Miller
    Member
    from NC usa

    They should they came from the factory with 31" tall tires.
     
    Last edited: Nov 29, 2013

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